The Tiernan Gallery and Art Museum distributes to its visitors a printed guide to its collections.The museum has about 18,000 visitors per year.Holding costs for the brochures are 20%,and it costs $30 to place an order with the printer.The printer has offered the following discount schedule: 
How many brochures should be printed at a time?
Definitions:
Visual Cliff
An experimental setup used to study depth perception and fear of heights in infants, involving an apparent, but safe, drop-off.
Good-natured
Possessing a pleasant, friendly, and easygoing personality.
Secure
Relating to being free from danger or threat, often used in the context of data protection or emotional safety.
Intonation
The variation in pitch while speaking, which can affect the meaning of words and convey emotions or attitudes.
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